As mentioned, .dev is a gTLD and it's been added to HSTS Preload list.
All major browsers are using that same list (afaik)https://hstspreload.org

So it's only a matter of time, until (all) other browser have updated to this latest list.

When I first heard about this .dev gTLD, I started to anticipate this kind of situation and changed to .test domain (which is valid TLD meant for development). It took some time get used to it, but nowadays I have no problems using it.

Only problem is that I need to add leading slash to make browser understand what I want (load page instead of searching..)

One could argue that this is a bad move, and I mostly agree..but I have better things to do, than worry about this kind of small(ish) changes